Fix [f and ]f behavior in directory containing [, $

Without this, glob() fails to list files and [f/]f works incorrectly
when a path contains a special character such as "[".

Resolves: tpope#232

Author: ryym

plugin/unimpaired.vim

@@ -77,6 +77,7 @@ call s:MapNextFamily('t', 't', 'trewind')
 
 function! s:entries(path) abort
   let path = substitute(a:path,'[\\/]$','','')
+  let path = substitute(path, '[[$*]', '[&]', 'g')
   let files = split(glob(path."/.*"),"\n")
   let files += split(glob(path."/*"),"\n")
   call map(files,'substitute(v:val,"[\\/]$","","")')